Client Access Ports

I have a question. I have seen this somewhere and wondering how is this setup.

How can you setup on a cisco switch to have multiple vlan's be attached to one port to where the client can have multiple different subnets but never have to change there vlan to anything? For example

Provider switch (1.1.1.1/24 and 1.1.2.1/24) ported to the client switch. Client switch does not require anything put "plug and play" basic and can use both vlan's how is this possible? If you setup two different vlan's and trunked to that port it would require the client switch to have the vlan's setup but if you set it up as access mode on the provider switch port to the client only one vlan can be setup. Just wondering seen this before and wondering how to set this up. Or what it is called.

Are we sure we are talking vlans here and not just subnets? Otherwise you can just use secondary addresses on a single interface or on the SVI itself . You can use as many secondary addresses as youwant on a single interface or SVI though it's not good practice to use more than 1 or 2 secondaries.